期刊
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
卷 212, 期 -, 页码 74-80出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.elspec.2016.08.001
关键词
Reflection electron energy loss; spectroscopy; Band gap; Electron Rutherford backscattering
类别
资金
- Australian Research Council
We investigate the possibilities of measuring the band gap of a variety of semiconductors and insulators by reflection electron energy loss spectroscopy without additional surface preparation. The band gap is a bulk property, whereas reflection energy loss spectroscopy is generally considered a surface sensitive technique. By changing the energy of the incoming electrons, the degree of surface sensitivity can be varied. Here, we present case studies to determine the optimum condition for the determination of the band gap. At very large incoming electron energies recoil effects interfere with the band gap determination, whereas at very low energies surface effects are obscuring the band gap without surface preparation. Using an incoming energy of 5 keV a reasonable estimate of the band gap is obtained in most cases. (C) 2016 Elsevier B.V. All rights reserved.
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